RAGGIO C
202
EN
cod. 3541V280 - Rev. 01 - 04/2021
F19
A10
Flow sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F22
A11
Return sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F12
DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F17
A13
Fume probe fault
Probe damaged
Check the wiring or replace the fume
probe
Wiring shorted
Wiring disconnected
A14
Fume extraction duct
safety device intervention
Fault F03 generated 3
times in the last 24 hours
See fault F03
A23
Optimum water pressure
not reached in foreseen
time
Water supply trouble
Check the connection to the water sup-
ply
Loading valve blocked in
closed position
Check the loading valve and valve con-
trol relay
A24
Water pressure restored
more than 3 times in 24h
Heating system leaks
Check for leaks in the heating system
DHW exchanger damaged Check the exchanger
A26
Excessive water pres-
sure more than 3 times in
an hour
Pressure too high Expan-
sion vessel empty or dam-
aged
Partially drain the system
Expansion vessel empty or
damaged
Check the expansion vessel
F34
Supply voltage under
170V
Electric mains trouble
Check the electrical system
F20
F37
System water pressure
too low
Pressure too low
Fill the system
Water pressure switch/
pressure transducer not
connected or damaged
Check the water pressure switch/pres-
sure transducer
F39
External probe fault
Probe damaged or wiring
shorted
Check the wiring or replace the sensor
Probe disconnected after
activating the sliding tem-
perature
Reconnect the external probe or disa-
ble the sliding temperature
F41
Activation of maximum
DELTA T protection
Heating sensor damaged
Check the correct positioning and oper-
ation of the heating sensor
Return sensor damaged
Check the correct positioning and oper-
ation of the return sensor
No water circulation in the
system
Check the circulating pump
Air in the system
Vent the system
F21
F40
System water pressure
too high
Pressure too high
Partially drain the system
Filling valve blocked in
open position
Check the filling valve and valve control
relay
Expansion vessel empty or
damaged
Check the expansion vessel
Fault code
Fault
Possible cause
Cure